A intelligence memo is photographed in Washington, Friday, Feb. 2, 2018. After President Donald Trump declassified the memo, the Republican-led House Intelligence Committee released the memo based on classified information that alleges the FBI abused U.S. government surveillance powers in its investigation into Russian election interference. (AP Photo/Susan Walsh)

Rep. Adam Schiff, D- Calif., ranking member of the House Intelligence Committee, speaks at the University of Pennsylvania in Philadelphia, Thursday, Feb. 1, 2018. (AP Photo/Matt Rourke)

WASHINGTON (AP) — House Republicans on Friday released a partisan and bitterly disputed memo that they say shows surveillance abuses in the early stages of the FBI's investigation into the Trump campaign and Russia.

The memo, prepared by Republicans on the House intelligence committee, says there was "a troubling breakdown of legal processes" in the Russia investigation.

President Donald Trump, who advocated for the memo's release over the fierce objections of the Justice Department and the FBI, told reporters the document shows "a lot of people should be ashamed of themselves."

"I think it's terrible," Trump said. "You want to know the truth. I think it's a disgrace. What's going on in this country, I think it's a disgrace."

The memo, which the FBI has said is inaccurate and missing critical context, asserts that current and former FBI and Justice Department leaders signed off on a surveillance warrant to monitor communications of a former Trump campaign associate.

The document also asserts that opposition research, conducted by a British spy and funded in part by the Democratic National Committee and Clinton campaign, formed a critical basis for the allegations contained in the warrant application.

They say that research should not have been a basis for the warrant because it contains unproven allegations.

Attorney General Jeff Sessions speaks with Deputy Attorney General Rod Rosenstein, during the opening of the summit on Efforts to Combat Human Trafficking at Department of Justice in Washington, Friday, Feb. 2, 2018. President Donald Trump, dogged by an unrelenting investigation into his campaign's ties to Russia, lashes out at the FBI and Justice Department as politically biased ahead of the expected release of a classified Republican memo criticizing FBI surveillance tactics. (AP Photo/Jose Luis Magana)

The release of the memo is likely to further divide Trump and his FBI and Justice Department leaders, and the president lashed out anew on Friday morning on Twitter. He has supported the memo release in apparent hopes that it could help undermine the probe being led by special counsel Robert Mueller, which he has called a "witch hunt."

"The top Leadership and Investigators of the FBI and the Justice Department have politicized the sacred investigative process in favor of Democrats and against Republicans - something which would have been unthinkable just a short time ago. Rank & File are great people!" Trump tweeted.

The tweet came as U.S. news coverage was dominated by reports that the FBI and the Justice Department had objected strenuously to the memo's release. Earlier this week, the FBI declared it had "grave concerns" about its accuracy.

Trump's tweet and his approval of the memo release set up a clash with the man he picked to lead the FBI, Christopher Wray, after firing James Comey as agency director. It also seemed at odds with House Speaker Paul Ryan who said a day earlier "this memo is not an indictment of the FBI or the Department of Justice."

Democrats say the memo cherry-picks intelligence in an effort to smear law enforcement investigating whether Trump associates collaborated with Russia to sway the 2016 presidential election.

"This is designed to impugn the credibility of the FBI, to undermine the investigation, to give the president additional fodder to attack the investigation. And it's a tremendous disservice to the American people," Rep. Adam Schiff, the senior Democrat on the House Intelligence Committee, said on CBS "This Morning."

The document was written by GOP lawmakers as part of an effort to reveal what Republicans say are surveillance abuses by the FBI and the Justice Department early in Russia investigation, before special counsel Mueller was appointed to take it over.

The House intelligence panel voted along party lines Monday to put the memo out, giving Trump five days to reject the release under committee rules. But Trump also had the power to declassify the document himself.

Senior FBI officials, including Wray, also made direct appeals to the White House, warning that it could set a dangerous precedent.

President Donald Trump listens during a meeting with North Korean defectors where he talked with reporters about allowing the release of a secret memo on the FBI's role in the Russia inquiry, in the Oval Office of the White House, Friday, Feb. 2, 2018, in Washington. (AP Photo/Evan Vucci)

Democrats on the intelligence panel made a last-ditch effort Wednesday evening to stop the release, saying the memo had been "secretly altered" by the Republicans who wrote it. In a letter to the House Intelligence Committee Chairman Devin Nunes, Schiff wrote that committee Democrats had discovered changes that were made after the vote Monday.

"The White House has therefore been reviewing a document since Monday night that the committee never approved for public release," Schiff said in the letter.

Schiff asked Nunes for another vote on the memo, but Republicans didn't waver. Nunes spokesman Jack Langer said the committee vote was "procedurally sound."

This all comes as special counsel Mueller is investigating whether the Trump campaign improperly coordinated with Russia and whether Trump sought to obstruct the inquiry by, among other actions, firing Comey. Republicans have intensified their pressure on the Justice Department as Mueller's probe has moved closer to Trump's inner circle.

Trump has been telling confidants in recent days that he believed the GOP House members' document would validate his concerns that the FBI and Justice Department conspired against him. The president also has told allies that he believes the memo bolsters his claim that accusations of collusion between his campaign and Russian officials are false and part of a conspiracy to discredit his election.

Comey weighed in on Twitter as well: "All should appreciate the FBI speaking up. I wish more of our leaders would. But take heart: American history shows that, in the long run, weasels and liars never hold the field, so long as good people stand up. Not a lot of schools or streets named for Joe McCarthy."